You'll find people on both sides of the fence on this one. 20G longs are great for juvies IMO, and they're what, 2.5 feet long? I bet the tubs you're talking about are wider though.

I think you can set it up just fine for juvies personally, typical 2 hide 1 water bowl scenario, and juts because it's a tub doesn't mean you can't decorate it more.